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| sound ray (линия, проведённая в направлении распространения звука от источника, перпендикулярная к фронту звуковой волны) | |||
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линия звука : 14 phrases in 5 subjects |
| Aerohydrodynamics | 3 |
| Electronics | 1 |
| Makarov | 1 |
| Mass media | 8 |
| Military | 1 |
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